I don't know synecdoche from metonymy, but I do know that two-thirds of a pun is PU! :-)

To / Two / Too

Play on words otherwise
Known as a pun,
Keeps us in stitches with
Homophones, words which can
Generate fun.

There are three words pronounced [tu] in English: to/two/too. Notice how the meanings of the following sentences change depending upon which form you use.

"Balls!" said the queen. "If I had ___, I'd be king." The king laughed ___; he had ___!

[ A-G ] [ H-M ] [ N-S ] [ T-Z ]